From b6ef243cf401314e95e19ed7db56401895f1e38e Mon Sep 17 00:00:00 2001
From: Ellpeck <me@ellpeck.de>
Date: Thu, 31 Dec 2020 17:22:51 +0100
Subject: [PATCH] GenericFont support for zero-width spaces

---
 MLEM/Font/GenericFont.cs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/MLEM/Font/GenericFont.cs b/MLEM/Font/GenericFont.cs
index 856cd62..0a8a40a 100644
--- a/MLEM/Font/GenericFont.cs
+++ b/MLEM/Font/GenericFont.cs
@@ -21,6 +21,11 @@ namespace MLEM.Font {
         /// Whereas a regular <see cref="SpriteFont"/> would have to explicitly support this character for width calculations, generic fonts implicitly support it in <see cref="MeasureString"/>.
         /// </summary>
         public const char Nbsp = '\u00A0';
+        /// <summary>
+        /// This field holds the unicode representation of a zero-width space.
+        /// Whereas a regular <see cref="SpriteFont"/> would have to explicitly support this character for width calculations and string splitting, generic fonts implicitly support it in <see cref="MeasureString"/> and <see cref="SplitString"/>.
+        /// </summary>
+        public const char Zwsp = '\u8203';
 
         /// <summary>
         /// The bold version of this font.
@@ -108,6 +113,9 @@ namespace MLEM.Font {
                     case Nbsp:
                         xOffset += this.MeasureChar(' ').X;
                         break;
+                    case Zwsp:
+                        // don't add width for a zero-width space
+                        break;
                     default:
                         xOffset += this.MeasureChar(c).X;
                         break;
@@ -154,7 +162,7 @@ namespace MLEM.Font {
 
         /// <summary>
         /// Splits a string to a given maximum width, adding newline characters between each line.
-        /// Also splits long words.
+        /// Also splits long words and supports zero-width spaces.
         /// </summary>
         /// <param name="text">The text to split into multiple lines</param>
         /// <param name="width">The maximum width that each line should have</param>
@@ -164,7 +172,7 @@ namespace MLEM.Font {
             var total = new StringBuilder();
             foreach (var line in text.Split('\n')) {
                 var curr = new StringBuilder();
-                foreach (var word in line.Split(' ')) {
+                foreach (var word in line.Split(' ', Zwsp)) {
                     if (this.MeasureString(word).X * scale >= width) {
                         if (curr.Length > 0) {
                             total.Append(curr).Append('\n');